Wasps of the Genus Tacliytcs. 39 



Hah. Portuguese E. Africa, Valley of Kola River, near 

 E. Mt. Cbiperoue, 1500-2000 ft. (S. A. Neuve), April. 



46. Tachytes disputabilis, sp. n. 



cf . Xiger ; tarsis articulis 4 apicalibus ferrugineis, posticis supra 

 infuscatis ; tegulis testaceis ; alls hj'alinis ; venis ferrugineis, 

 apiee fuscis ; fi'onte clypeoque aureo-pubescentibus ; thorace 

 segmentoque mediano sparse aureo-griseo-pTibesceutibus ; seg- 

 mentis dorsalibus 4 basalibus fascia apicali griseo-argenteo- 

 pubeseente ; segmento dorsali septimo argeuteo pubesceute ; 

 galea lata, scapo breviore. 

 Loug., d" , 11 mm. 



(^ . Clypeus broadly truncate at the apex ; vertex not 

 distinctly punctured, opaque ; eyes separated on tlie vertex 

 by a distance about equal to the combined length oF the 

 first and second joints of the t]agellum. Thorax micro- 

 scopically punctured ; median segment nearly twice as long 

 as the scutellum. Second sternite closely and minutely 

 punctured ; seventh tergite broadly rounded at the apex ; 

 eighth sternite emarginate, the apical angles produced. 

 Basal joint of fore tarsus with four spines ; spur of hind 

 tibiae shorter than the basal joint of the hind tarsus. Thiid 

 cubital cell nearly as long on the cubitus as the second, 

 extending on the cubitus beyond the apex of the radial cell. 



Hud. Nyasaland, S.W. of Lake Chilwa (S. A. Neuve), 

 January. 



This is near pulc/u-icoi'nis, from Avhich it differs in the 

 colour of the antenna? and in the much narrower seventh 

 tergite and eighth sternite. 



47. Tachytes instabilis, sp. n. 



\ery similar to T. inexorabilis in both sexes, but the 

 pubescence on the thorax and median segment is golden 

 grey, very short and close lying under sparse, long, erect 

 hairs ; the male has the seventh tergite broadly subtruncate 

 at the apex, not rounded, and the eighth sternite much 

 broader, tliough also emargiuate ; the punctures of the 

 sternites are distinctly larger. The female difiers in the 

 sjjarse and large punctures of the third, fourth, and fifth 

 sternites, which are shining, whereas in inexorabilis, except 

 at the extreme base, they are opaque and very minutely and 

 closely punctured ; the eyes are a little nearer together on 

 the vertex, being separated by a distance equal to the length 

 of the two basal joints of the flagellum ', the wings in both 



